/ Dictionary / Index I ionization potential: Meaning and Definition of Find definitions for: ioniza'tion poten"tial Pronunciation: [key] — Physics. Physics. the energy required to remove an electron from an atom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ionization chamber ionize Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language